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RotaMeter correction factor

  1. May 15, 2016 #1
    Hello Dear friends

    i was doing tests to evaluate the performance of my Engine Test bench, (197/225cc engine 12.6kW IC SI engine, Propane) For mass flow rate i have used a rota meter to find the Volume flow rate and convert it to mass flow rate, i couldn't find a rotameter for propane so i decided to go for oxygen rotameter

    now that i have got the values they are 4, 4.5, 4.8, 5 lit/min
    as they are the indicated flow rates

    for correction i have used these equations

    Cdensity=(density of oxygen/density of propane)^1/2
    Cpressure= (p+0.1013/ps+0.1013)^1/2
    p=actual operating pressure
    ps=standard or designed pressure for rotameter use
    Ctemperature=(ts+273/t+273)^1/2
    ts=standard temperature for rotameter use
    t=actual operating temperature

    Gas Correction factor(GCF)=Cdensity*Cpressure*Ctemperature
    Actual Flow = Indicated Flow rate * GSF
    the density of propane is 1.873g/lit
    operating temperature was recorded as 10C
    operating pressure was 0.005MPa
    standard values for rotameter are 1.292g/lit, 20C, 0.343MPa

    so the actual flow values are 1.688, 1.899, 2.0265, 2.111 lit/min

    i just wanted to ask that is it correct method or am i missing something because when i evaluate the thermal efficiency of my test bench it gives me above 60% which is no way possible
     
    Last edited by a moderator: May 15, 2016
  2. jcsd
  3. May 20, 2016 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
     
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